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#375864 - 23rd Dec 2009 12:19pm Torch home build help wanted
pacef8 Offline
Smartchild

Registered: 27th Dec 2008
Posts: 473
Loc: south wirral
Hi there,i have a technical question regarding bulbs leds volts amps etc that i don't understand.

So here goes, i have a twin set mountain bike bulb setup


http://www.blt-lights.com/manuals/blt_explorer.pdf

And i want to take out the old mr11 bulbs and fit a cree led kit like this

http://www.cutter.com.au/proddetail.php?prod=cut947

The system is 6 volts, 4.3 amp/hour, sealed lead acid bottle battery
Low beam 6v 6w MR-11 Halogen (avg.run time per full charge: 3.25 hrs.)

How long would i get now on a 370 lumen, and more to the point would this all work together or do i need something else and how easy would it be to solder together.

All the blt system works fine now it just doesn't work for very long and the bulbs are a bit dim compared to the white crees running on my mining caplamp right now.

Ta
pace

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#375867 - 23rd Dec 2009 12:48pm Re: Torch home build help wanted [Re: pacef8]
KevinFinity Offline

Forum Master

Registered: 30th Apr 2009
Posts: 2324
Loc: Wirral
I have made many torch contraptions over the years for both my bike and hand held but I have no experience of crees. It you could find out the currant draw of the crees you are planning to use you could work out the run time.

Have you looked here?. Everything you need to know about all things that glow are here.

*****WARNING! MAJOR GEEK WEBSITE URL ALERT!!!*****

http://candlepowerforums.com/vb/index.php?

Have a look in the bicycles sub forum in the transportation lighting section.
Yes I am a member. sorry

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#375874 - 23rd Dec 2009 12:57pm Re: Torch home build help wanted [Re: KevinFinity]
KevinFinity Offline

Forum Master

Registered: 30th Apr 2009
Posts: 2324
Loc: Wirral
Quote:
1 x Recom RCD-24-70/W. A 700 mA wired driver in very small form factor that is 96% efficient, meaning more light, less heat


Does that mean it only draws 700ma?

Currently the 6v 6w in your low beam draws 1 amp and the 15w in the high beam draws 2.5 amps. So if thats the case the crees would be a significant improvement. Someone who can remember what they where taught in collage better than I can could work out the actual runtime for you.

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#375877 - 23rd Dec 2009 1:26pm Re: Torch home build help wanted [Re: KevinFinity]
pacef8 Offline
Smartchild

Registered: 27th Dec 2008
Posts: 473
Loc: south wirral
wd40 informs me that 1 watt at one amp will be 4.3 hours based on my duffish bottle battery

watts = volts * amps - is all you need to know.


A 6 watt bulb at 6 volts, uses 1 amp (ie 6 watts divided by 6 volts - derived from: "watts=volts*amps", therefore "amps=watts/volts").

Therefore a 4.3 amp/hour battery will provide 1 amp for 4.3 hours (you are actually getting 3.25 hours, therefore battery must be a bit dud).

The lumen is a measure of light, and has nothing to do with the electrical power used, it depends more upon the efficiency of the light source (led or bulb). But - a 1 watt cree will still last for the 4.3 hours, but give out a lot more light.

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#376008 - 24th Dec 2009 12:12am Re: Torch home build help wanted [Re: pacef8]
diggingdeeper Offline

Wiki Master

Registered: 9th Jul 2008
Posts: 10272
Loc: Birkenhead
The amp-hour rate for rechargable batteries is based on 20 degrees C and 10 hour discharge current. Higher currents will have a lower amp-hour, likewise temperature at charge and discharge can affect capacity.

What CREEs are you using? The 6V might be a bit too low voltage to drive them after the current regulator.
_________________________
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

When the debate is lost, slander becomes the tool of the loser. Socrates

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#376028 - 24th Dec 2009 8:41am Re: Torch home build help wanted [Re: diggingdeeper]
pacef8 Offline
Smartchild

Registered: 27th Dec 2008
Posts: 473
Loc: south wirral

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